[Digikam-devel] preview window not showing filter out

[Matthias Welwarsky]

Hi,

how can it happen that the preview image inside the editor does not show the 
result of a filter? The code in putPreviewData() is a copy from the 
LevelsAdjust tool. The used filter itself seems to work, because after ending 
the tool the final image is correct.

This is the code of putPreviewData()

void FilmTool::putPreviewData()
{
    DImg preview = filter()->getTargetImage();
    d->previewWidget->setPreviewImage(preview);

    // Update histogram.

    if (d->destinationPreviewData)
    {
        delete [] d->destinationPreviewData;
    }

    d->destinationPreviewData = preview.copyBits();
    d->gboxSettings->histogramBox()->histogram()->updateData(d-
>destinationPreviewData,
            preview.width(), preview.height(), preview.sixteenBit(),
            0, 0, 0, false);
}

Interestingly, the output histogram is also correct, just the preview window 
doesn't show the result correctly...

br
matthias